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Depending on the combination of packages loaded, the width of \widetilde can be erroneous.

I guess this is a bug in koma, but it as also somehow affected by the package lmodern, albeit only when combined with koma.

I assume I need to find a replacement for lmodern or quit using koma. Is there another remedy?

0. Desired output

\documentclass{article} % \usepackage{amsmath} % does not make a difference % \usepackage{lmodern} % does not make a difference \begin{document} \begin{equation} \widetilde{c_x'} \widetilde{c_y'} \end{equation} \end{document}

desired

1. KOMA without amsmath

\documentclass{scrartcl} \begin{document} \begin{equation} \widetilde{c_x'} \widetilde{c_y'} \end{equation} \end{document}

erroneous

2. KOMA with amsmath

\documentclass{scrartcl} \usepackage{amsmath} \begin{document} \begin{equation} \widetilde{c_x'} \widetilde{c_y'} \end{equation} \end{document}

desired

3. KOMA with lmodern (with or without amsmath)

\documentclass{scrartcl} % \usepackage{amsmath} % does not make a difference \usepackage{lmodern} \begin{document} \begin{equation} \widetilde{c_x'} \widetilde{c_y'} \end{equation} \end{document}

erroneous

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2
  • 2
    The default font size of article is 10pt. The default font size of scrartcl is 11pt. If you use \documentclass[10pt]{scrartcl} you get the same result as with \documentclass{article} (as wanted). And if you use \documentclass[11pt]{article} you get the same result as with \documentclass{scrartcl} (as not wanted). So this does not depend on using a KOMA-Script class or not, but on the font sizes. Commented Mar 13, 2024 at 8:44
  • Ah I see, font size was the one aspect I did not consider checking. Setting \documentclass[11pt]{article} indeed produces the same weird appearance. \usepackage{amsmath} fixes that, but \usepackage{lmodern} then destroys that fix again. So I guess it is a side effect of lmodern. Commented Mar 13, 2024 at 9:06

2 Answers 2

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5

You forgot one option, namely fixcmex.

\documentclass{scrartcl} \usepackage{amsmath} \usepackage{lmodern} \usepackage{fixcmex} % does make a difference \begin{document} \begin{equation} \widetilde{c_x'} \widetilde{c_y'} \end{equation} \end{document}

enter image description here

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4

The difference you see with KOMA-Script only appears because KOMA-Script use 11pt fonts by default, while article uses 10pt. Load the article class with 11pt you'll see the same thing.

\widetilde is a math accent which extends according to its content. In your case, x is slightly larger than y, and the larger form is used with 11pt fonts (it's the same, if you use m as subscript). The simplest you can do is to move the subscripts outside \widehat:

\begin{equation} \widetilde{c'}_{\! x} \widetilde{c'}_{\! y} \end{equation}

widetitle shorter

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5
  • Some seconds earlier. ;-) Commented Mar 13, 2024 at 8:48
  • @cabohah I saw at validation. Sorry. Commented Mar 13, 2024 at 8:49
  • BTW: I can remember, that there was already a similar question some time ago. But I was not able to find it. So maybe it is good to once again have this question/answer. Commented Mar 13, 2024 at 8:52
  • Ok, makes sense, but the large space preceding the subscript versus the small space after it is really awkward. Commented Mar 13, 2024 at 9:11
  • @Bastian You right. I tweaked a bit the space with \! but it's not perfect. Otherwise see How can I manually choose the size of a wide accent? (math mode). Commented Mar 13, 2024 at 9:46

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